Question Completion Status: QUESTION 14 Some marathons allow two runners to spli

Question

Question Completion Status: QUESTION 14 Some marathons allow two runners to split the marathon by each running a half marathon. Amanda and Tammy plan to split a marathon. Amanda's half marathon averages 85 minutes with a standard deviation of 3 minutes, and Amanda's half marathon average 92 minutes with a standard deviation of 4 minutes. Assume that their times are independent. The expected time for Tammy and Amanda to complete the marathon is 177 minutes. What is the standard deviation of their total time? a. 3 minutes O b. 25 minutes O C. 4.5 minutes d, 1 minute Oe. 5 minutes QUESTION 15 In a certain town, 60% of households own a cell phone, 50% have high speed Internet and 30% have both a cell phone and high speed Internet. The proportion of houses that have neither a cell phone nor high speed Internet is:

Explanation / Answer

standard deviation(Tammy+Amanda)=sqrt(3^2+4^2)

=sqrt(9+16)

=sqrt(25)

=5 minutes

OPTION E

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